Achieving high success at every level, Varitek is one of only two players in the history of the sport to have played in the World Championship game of the Little League World Series, in the National Championship game of the College World Series, and in the Major League World Series (Ed Vosberg is the other). Varitek stands alone as the only baseball player in history to have played in the three aforementioned World Series along with playing on the Olympic Baseball team, and in the World Baseball Classic. As well, his Lake Brantley High School baseball team won the Florida State Championship his senior year in 1990 and was named the number one high school baseball team in the land by a USA Today poll.[1]

While in high school, Varitek was a third baseman and catcher for the Lake Brantley High School baseball team in Altamonte Springs, FL. The Patriots' usual catcher was Jerry Thurston, himself a pro prospect. In 1990, the Patriots won the state championship.[4] He was also a member of the 1992 U.S. Olympic team and won the Dick Howser Trophy for National Collegiate Player of the Year. He was also named Baseball America's 1993 College Player of the Year; he appeared in 3 games for the U.S. team in the 2006 World Baseball Classic.

Varitek played two summers in the Cape Cod Baseball League with the Hyannis Mets. In 1993, he hit .371 while winning both the league batting championship and MVP. He was drafted 21st overall in the first round by the Minnesota Twins in 1993,[5] but opted to return for his senior year of college. Following graduation, Varitek signed with agent Scott Boras and was drafted by the Seattle Mariners in the first round of the 1994 amateur draft, with the 14th pick overall.[6] A pioneer of the loopholes in the draft process, Varitek signed with the St. Paul Saints in the independent Northern League[7] before agreeing to terms with the Mariners, and consequently did not enter the Mariners' minor league system until 1995. When he finally did join the franchise, Varitek was sent to the AA affiliate Port City Roosters where he first met pitcher and longtime teammate Derek Lowe. He was traded with Lowe to the Red Sox during the 1997 season, in return for relieverHeathcliff Slocumb, often cited as one of the best trades in the Red Sox's favor in recent history.

Varitek was called up for a single game on September 24, 1997, collecting a single in his only at bat. The next season, Varitek split time with incumbent catcher Scott Hatteberg playing in 86 games.[8] Varitek showed signs of things to come in the 1998 season and with a strong spring training following the season, Varitek ensured himself the starting role. 1999 was a breakout year for the young catcher; he played 144 games in that season while hitting for a .269 average, with 20 home runs, and 76 RBIs.[8] 1999 also gave Varitek his first taste of the playoffs. Varitek went 5-21 with 3 RBI in the 1999 ALDS against the Cleveland Indians[9]Template:Verify credibility and 4-20 with 1 RBI in the ALCS against the New York Yankees.[10]Template:Verify credibility Varitek looked forward to building on his success from the year before, but in 2000 he did not show the same potential and had a disappointing offensive output. He hit just .248 with only 10 home runs and 65 RBI.[8] Prior to the 2001 season, Varitek signed a 3 year $14.9 million contract with the Red Sox, and off to a hot start before he was sidelined for the season with a broken left elbow after he dove to catch a foul ball on June 7. The play went on to be a top Web Gem for the month of July in 2001. Varitek finished the season with a .293 average, 7 home runs, and 25 RBI in just 51 games played.[8]

Varitek returned to the Red Sox lineup full-time in the 2002 season. The return did not go smoothly, however, as Varitek struggled to find himself at the plate. Despite not reaching his full offensive potential,[8] pitchers and coaches alike began to notice how much Varitek's preparation and knowledge of the game was helping the pitchers. His study habits and extra hours of work with pitchers would soon become his defining attribute and make him a household name around the league. Varitek and the Red Sox entered the 2003 season with a renewed fire to reach the playoffs after missing in the previous three years. Varitek instantly became a leader in the working class clubhouse featuring new faces such as Kevin Millar, David Ortiz, Bill Mueller, and Todd Walker along with original players Trot Nixon and Lou Merloni. 2003 was Varitek's best year to date and earned his first all-star selection after the fans voted him on with the All-Star Final Vote. He was hitting .296 with 15 HRs and 51 RBIs[11] going into the all-star break and finished the season off with a solid .273 average, 25 HRs and 85 RBIs,[8] all career highs. Varitek also led the Red Sox to a Wild Card berth and their first playoff appearance since 1999.

In 2004, Varitek compiled a career-high .296 batting average with 18 home runs and 73 RBI. During a nationally televised game on July 24, 2004, Varitek shoved his glove into the face of Yankees' Alex Rodriguez to protect Bronson Arroyo, causing a bench-clearing brawl. Though he was ejected (along with Rodriguez) from the game following the incident, the moment sparked Boston to an 11-10 come from behind victory. It is also sometimes regarded as the turning point in the Red Sox season, as they posted MLB's best record after the melee. The Red Sox culminated the season with their first World Series championship in 86 years. Having played in this World Series, Varitek became the second player to have played in the Little League World Series, College World Series, and Major League World Series. At the end of the year, Varitek became a free agent and signed a 4-year, $40-million contract with the Red Sox.

According to baseball media, Varitek is valued as a catcher for his ability to work with pitchers, using scouting reports and video footage to plan each game. He also won his first Gold Glove Award, his first Silver Slugger, and his second All-Star selection in 2005.

On July 18, 2006, Varitek played his 991st game at catcher for the Boston Red Sox, breaking Carlton Fisk's club record. That game was a home game vs. Kansas City, during which Varitek's achievement was recognized before the top of the 5th inning (after the game was official and couldn't be cancelled due to weather). Varitek received a standing ovation from the sellout crowd at Fenway Park for a few moments before play began. On July 31, 2006, Varitek was injured rounding the bases in a 9-8 victory over the Cleveland Indians (his 1000th Career Game as catcher), but said he believed the initial injury to the knee occurred while he was blocking home plate to make the tag against the Angels Mike Napoli on July 29, 2006. He had surgery on August 3, 2006 to repair torn cartilage in his left knee. Varitek returned to the Red Sox lineup on September 4, following a short rehabilitation assignment in Pawtucket.

On September 19, 2006, Jason was honored during a pre-game ceremony as the first Red Sox catcher to catch 1,000 games. The Red Sox Captain was presented with a special award by Hall of Famer Carlton Fisk, who held the Boston club record with 990 career games caught before Varitek surpassed that total on July 18 versus Kansas City. The Sox backstop caught his 1000th game on July 31 and by the evening of the ceremony had appeared in 1,009 games behind the plate.
That same night, Jason also received the 2006 Red Sox Heart and Hustle Award from the local chapter of the Major League Baseball Players Alumni Association, which is presented to a player exemplifying the values, tradition, and spirit of the game of baseball.

In 2007, Varitek and the Red Sox returned to the World Series once again, winning for the second time in four years. During the season, Varitek enjoyed a couple of personal highlights, reaching his 1000th career hit and, on September 1, catching rookie Clay Buchholz's no-hitter. Varitek became just the twelfth catcher in Major League history to catch three separate no-hitters, having been behind the plate for previous no-no's by Derek Lowe and Hideo Nomo.

Following the 2008 season, Varitek became a free agent. Following the advice of his agent, Scott Boras, Varitek declined the Red Sox' offer of arbitration, which likely would have gotten him a contract around $10 million for the upcoming season, as Boras believed he could get Varitek something in the range of 4-years, $40 million. However, the was no market for Varitek's services, due to his status as a Type-A free agent, as well as his considerable offensive decline over the past few seasons. On January 31, Varitek signed a one-year, $5 million deal with a team option for 2010. If the team should choose to void the option, Varitek could pick up his own option, which would give him a salary of $3 million for 2010, with an additional $2 million in performance-based incentives. Varitek's playing time was reduced in the last two months of 2009, when the Red Soxc acquired Vincent Martinez from Cleveland as a catcher-1st baseman. Martinez was named the regular catcher for 2010, and Jason Varitek remained with the Red Sox as a back-up catcher.

In honor of being captain, Jason released Captain Cabernet, a charity wine with proceeds benefiting Pitching In For Kids and Children's Hospital Boston.